US6167853B1 - Hydraulic control device for at least one lifting valve - Google Patents
Hydraulic control device for at least one lifting valve Download PDFInfo
- Publication number
- US6167853B1 US6167853B1 US09/403,167 US40316700A US6167853B1 US 6167853 B1 US6167853 B1 US 6167853B1 US 40316700 A US40316700 A US 40316700A US 6167853 B1 US6167853 B1 US 6167853B1
- Authority
- US
- United States
- Prior art keywords
- valve
- pressure
- hydraulically
- control
- valve stem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
Definitions
- the present invention relates to a hydraulic control device for at least one lifting valve, and more particularly to a hydraulic control device having a valve stem associated with a first spring for loading in a valve-closing direction and a second hydraulically regulatable spring for loading in a valve-opening direction, and which is connected to a control piston arranged to be loaded hydraulically on two sides thereof, an operation of closing or opening the at least one lifting valve being capable of being triggered by an actuator of a central control unit.
- valve control which guides a linearly moveable lifting valve.
- the valve control has a valve stem on which a helical compression spring acts in the valve-closing direction and an oil-pressure spring temporarily acts in the valve-opening direction.
- the valve control further has a control piston which is connected to the valve stem, is arranged in a working space, is capable of being loaded with a working fluid and which, in the region of each of its end positions, partially delimits a plunging space belonging to the working space and capable of being separated hydraulically from the latter.
- An object of the present invention is to provide a control device by which malfunctions can be compensated simply.
- the second hydraulically regulatable spring means is assigned a hydraulically acting auxiliary control member which, in the event of an actuating operation of the actuator in the closing direction of the at least one lifting valve, relieves the second hydraulically regulatable spring means of pressure to below the actuating force of the first spring means. Consequently, the pressure of the second hydraulically regulatable spring means can be lowered separately and quickly until the compressive force of the first spring device predominates over that of the second hydraulically regulatable spring device.
- the lifting valve is in any position, therefore, a movement for resetting the latter can be triggered by activating the auxiliary control member, without a reduction in the supply pressure having to be carried out.
- the auxiliary control member may be activated directly together with the activation of the actuator or indirectly as a result of the activation of the actuator and by virtue of the resulting actuating operation.
- This activation may take place mechanically, electronically, electrically, electromagnetically or pneumatically, as required, but preferably hydraulically. In the last-mentioned case, activation is preferably carried out via the same actuator which makes it possible to activate the control piston.
- the auxiliary control member has a 2/2-way valve function. This function can be implemented by particularly simple apparatus within the framework of the existing hydraulic system.
- the auxiliary control member is connected via control lines to a pressure supply line and a pressure relief line which are capable of being loaded by the actuator.
- the connection of the auxiliary control member to the existing hydraulic system can thereby be made particularly simply.
- FIG. 1 is a cross-sectional view of an embodiment of a hydraulic control device according to the invention for a linearly moveable lifting valve of an internal combustion engine, with a helical compression spring acting in the valve-closing direction and with a combination of a helical compression spring and an oil-pressure spring, the combination acting in the valve-opening direction when the lifting valve is in a closing position,
- FIG. 2 is a view of the control device similar to FIG. 1 but when the lifting valve is in the middle position
- FIG. 3 is a view of the control device similar to FIG. 1 in its middle position, but with the movement for resetting the lifting valve being triggered, and
- FIG. 4 is a view of the control device similar to FIG. 1 in which the lifting valve is opened completely (i.e., the lower end position).
- An internal combustion engine particularly for driving a motor vehicle, has, in a way known per se, a plurality of cylinders.
- the combustion spaces of the cylinder are each provided with at least one lifting valve for the supply of a fuel/air mixture of the discharge of the exhaust gas.
- the lifting valves are controlled by engine electronics serving as a central control unit.
- a hydraulic control device is provided for activating each lifting valve 1 .
- Each lifting valve 1 has a valve stem 2 and a spring receptacle 3 fixedly connected to the latter.
- the valve stem 2 is loaded via the spring receptacle 3 , by way of a prestressed compression spring 4 serving as a first spring device, in the valve-closing direction with a force which holds the lifting valve 1 in its position of rest illustrated in FIG. 1 .
- the valve stem 2 is mounted in a linearly displaceable manner with a piston region in a cylinder guide 5 which is an integral part of the housing 6 .
- the cylinder guide 5 is widened at one point to form a working space 33 , through which the piston region of the valve stem 2 passes.
- the piston region has, in the working space 33 , a control piston 7 which, in the embodiment illustrated, is connected in one piece to the valve stem 2 .
- the control piston 7 has a lower and an upper plunger piston 8 , 9 which each plunge into respective pressure spaces 34 , 35 in the region of an end position of the valve stem 2 .
- the pressure spaces 34 , 35 are configured in such a way that, when the valve stem 2 is in the end positions, they are in each case separated hydraulically from the remaining volume of the working space 33 by the plunger pistons 8 , 9 .
- the working space is part of a hydraulic system, described in more detail below, the pressure of which is controlled via at least one hydraulic pump, not illustrated, by corresponding supply lines 38 serving for pressure build-up and by a return line 39 serving for pressure relief. Moreover, the pressure build-up and pressure relief in the hydraulic system are controlled via an electromagnetic switching valve 46 which serves as an actuator and which is activated by corresponding switching signals from the engine electronics.
- annular ducts 22 , 24 , 27 , 29 , 31 are provided, distributed over the length of the piston region, in the cylinder guide.
- annular ducts 22 , 24 , 27 , 29 are arranged above the control piston 7 and therefore above the working space 33 , and a further annular duct 31 is arranged below the working space 33 .
- the annular duct 22 is connected directly to the supply line 38
- the annular ducts 29 , 31 are capable of being connected either to the further supply line 38 or to the return line 39 via connecting lines 30 , 32 and a branch point of the electromagnetic switching valve 46 .
- the branch point is in the form of railway points.
- the annular duct 27 is connected to a control slide 40 via a control line 28 for activating an auxiliary control member in the form of a 2/2-way valve.
- the annular duct 24 is connected, on one hand, via a connecting line to the return line 39 and, on the other hand, via a control line 26 to a working space of the control slide 40 of the 2/2-way valve 37 .
- the working space 33 is connected to the supply line 38 via a connecting line 36 .
- the cylinder guide 5 is adjacent a pressure space 20 which is connected to a further hydraulic volume 43 via a line 21 .
- the pressure space 20 and hydraulic volume 43 together form an oil-pressure spring which is connected in series with a helical compression spring 45 loaded with pressure via a cylinder 44 and the hydraulic volume 43 .
- the design and functioning of this hydraulic unit correspond to a hydraulic control device, such as is described in German Patent Application 196 21 951.5 not previously published, so that, for more detailed explanations, reference may be made to the disclosure in this patent application.
- the spring means designed in this way loads the valve stem 2 in the valve-opening direction, the pressure space 20 forming at the same time a lifting space for the valve stem 2 .
- the pressure space 20 is capable of being connected hydraulically, via ducts 11 and 14 running coaxially in the piston region of the valve stem 2 , to the working space and from there, via the connecting line 36 designed as a delivery line, to the supply line 38 , by virtue of the fact that a ball 17 mounted in a widening 19 of the duct 11 is deflected out of its position of rest illustrated in the drawings by a sufficient gradient between the pressure of the oil-pressure spring and the current supply pressure counter to the force of a prestressed compression spring 18 and the supply pressure loading the underside of the ball.
- This situation occurs when the supply pressure is lowered sharply, with a valve not completely extended.
- the oil-pressure spring is expanded to the supply pressure, whereupon the valve closes as a result of the force of the helical compression spring 4 .
- FIG. 1 shows, in this respect, the position of the valve stem 2 and of its piston region in an upper end position, in which the pressure space 35 is loaded via the groove 16 and the connecting line 30 is relieved of pressure.
- FIG. 4 illustrates the valve stem 2 and its piston region in the opposite lower end position, in which the pressure space 34 is loaded via the groove 15 and the delivery line 32 relieved of pressure.
- the respectively pressure-relieved pressure space 34 or 35 can be loaded with the supply pressure by a change-over of the switching valve 46 .
- the lifting valve is moved out of its upper end position by the pressure of the oil-pressure spring on the end face 2 ′ and out of its lower end position by the pressure of the compression spring 4 on the spring receptacle 3 .
- valve stem 2 is moved as far as the opposite end position. Functioning corresponds to the functioning of the control devices, such as are described in DE 195 01 495 C1 or DE 196 21 951.5.
- pressure loading takes place via the annular duct 22 in the cylinder guide 5 , via an annular groove 13 serving as a control groove and via control ducts 11 , 12 in the piston region of the valve stem 2 .
- the lifting valve 1 When the lifting valve 1 is in the position shown in FIG. 4, the pressure in the pressure space 20 , together with the hydraulic volume 43 , is capable of being reduced again via the control ducts 11 , 12 , the control groove 13 and the annular duct 24 , and also via the connecting line 25 and the return line 39 . It thereby becomes easier for the lifting valve 1 to be capable of being reset into the position shown in FIG. 1, and any renewed pressure loading in the position of rest according to FIG. 1 becomes possible.
- the pressure space 20 is assigned an auxiliary control member which is formed by a 2/2-way valve with a working space 37 and with a control slide 40 , a control line 28 , a restoring spring 41 and a connecting line 26 .
- the pressure 20 and the working space 37 for the control slide 40 are connected hydraulically to one another, but the connection is broken by the control slide 40 when the latter is in the rest position.
- the restoring spring 41 is essentially expanded and the control line 28 is relieved of pressure.
- the connecting line 26 is relieved of pressure in any situation, because it is permanently connected to the connecting line 25 via the annular duct 24 .
- control line 28 When the valve stem 2 is in an undefined middle position shown in FIG. 2, the control line 28 is connected to the connecting line 30 via the annular duct 27 , a control groove 10 in the piston region of the valve stem 2 and the annular duct 29 .
- the control line is capable of being loaded with the supply pressure as a result of the actuation of the switching valve 46 .
- the pressure acting on one end face 40 ′ of the control slide 40 causes the control slide 40 to be moved counter to the force of the restoring spring 41 into the position shown in FIG. 3 .
- the activated auxiliary control member opens the connection between the pressure space 20 and the connecting line 26 .
- the oil-pressure spring is relieved of pressure and the piston region of the valve stem 2 is pressed out of its middle position by the compression spring 4 back into the end position according to FIG. 1 .
- the lifting valve 1 has reached its upper end position, there is no longer a hydraulic connection between the annular ducts 27 , 29 via the control groove 10 . Instead, a connection of the annular ducts 27 , 24 ensures that the control line 28 is relieved of pressure and therefore that the control slide 40 is reset into its position of rest by the force of the compression spring 41 .
- control groove 10 and angular ducts 27 , 29 are appropriately configured geometrically, the aim of this being to ensure that, when the piston 4 is in any middle position, the two annular ducts 27 and 29 are hydraulically connected to one another via the control groove 10 , resetting can take place from any position of the lifting valve and also at any speed of the lifting valve, that is to say also during normal functioning.
Abstract
Description
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19716042A DE19716042C1 (en) | 1997-04-17 | 1997-04-17 | Hydraulic valve control device for internal combustion engine |
DE19716042 | 1997-04-17 | ||
PCT/EP1998/001630 WO1998048151A1 (en) | 1997-04-17 | 1998-03-20 | Hydraulic control device for at least one lift valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US6167853B1 true US6167853B1 (en) | 2001-01-02 |
Family
ID=7826782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/403,167 Expired - Lifetime US6167853B1 (en) | 1997-04-17 | 1998-03-20 | Hydraulic control device for at least one lifting valve |
Country Status (5)
Country | Link |
---|---|
US (1) | US6167853B1 (en) |
EP (1) | EP0975856B1 (en) |
JP (1) | JP3348201B2 (en) |
DE (2) | DE19716042C1 (en) |
WO (1) | WO1998048151A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6601552B2 (en) * | 1998-11-19 | 2003-08-05 | Daimlerchrysler Ag | Hydraulically controllable globe valve |
US20040123825A1 (en) * | 2002-12-17 | 2004-07-01 | Shuji Nagano | Valve system for internal combustion engine |
US20060283410A1 (en) * | 2005-06-16 | 2006-12-21 | Zheng Lou | Variable valve actuator |
US20060283411A1 (en) * | 2005-06-16 | 2006-12-21 | Zheng Lou | Variable valve actuator |
US20070022987A1 (en) * | 2005-08-01 | 2007-02-01 | Zheng Lou | Variable valve actuator |
US20070022988A1 (en) * | 2005-08-01 | 2007-02-01 | Zheng Lou | Variable valve actuator |
US20080054205A1 (en) * | 2006-08-30 | 2008-03-06 | Zheng Lou | Variable valve actuator with latches at both ends |
US8978604B2 (en) | 2012-03-31 | 2015-03-17 | Jiangsu Gongda Power Technologies Co., Ltd. | Variable valve actuator |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10124869C2 (en) | 2001-05-22 | 2003-06-26 | Caterpillar Motoren Gmbh & Co | Hydraulic control device for equivalent engine valves of a diesel engine |
GB2423794B (en) | 2005-03-01 | 2008-09-10 | Ford Global Tech Llc | An internal combustion engine having cylinder disablement and gas recirculation |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5193495A (en) * | 1991-07-16 | 1993-03-16 | Southwest Research Institute | Internal combustion engine valve control device |
US5221072A (en) | 1992-01-14 | 1993-06-22 | North American Philips Corporation | Resilient hydraulic actuator |
US5595148A (en) * | 1995-01-19 | 1997-01-21 | Mercedes-Benz Ag | Hydraulic valve control device |
US5680841A (en) * | 1995-08-08 | 1997-10-28 | Diesel Engine Retarders, Inc. | Internal combustion engines with combined cam and electro-hydraulic engine valve control |
US5713315A (en) * | 1995-06-30 | 1998-02-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Multiple step valve opening control system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3836725C1 (en) * | 1988-10-28 | 1989-12-21 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
DE19621951C1 (en) * | 1996-05-31 | 1997-07-10 | Daimler Benz Ag | Control device for hydraulic valves, especially in engines |
-
1997
- 1997-04-17 DE DE19716042A patent/DE19716042C1/en not_active Expired - Fee Related
-
1998
- 1998-03-20 DE DE59802536T patent/DE59802536D1/en not_active Expired - Lifetime
- 1998-03-20 US US09/403,167 patent/US6167853B1/en not_active Expired - Lifetime
- 1998-03-20 WO PCT/EP1998/001630 patent/WO1998048151A1/en active IP Right Grant
- 1998-03-20 EP EP98917027A patent/EP0975856B1/en not_active Expired - Lifetime
- 1998-03-20 JP JP54486198A patent/JP3348201B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5193495A (en) * | 1991-07-16 | 1993-03-16 | Southwest Research Institute | Internal combustion engine valve control device |
US5221072A (en) | 1992-01-14 | 1993-06-22 | North American Philips Corporation | Resilient hydraulic actuator |
US5595148A (en) * | 1995-01-19 | 1997-01-21 | Mercedes-Benz Ag | Hydraulic valve control device |
US5713315A (en) * | 1995-06-30 | 1998-02-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Multiple step valve opening control system |
US5680841A (en) * | 1995-08-08 | 1997-10-28 | Diesel Engine Retarders, Inc. | Internal combustion engines with combined cam and electro-hydraulic engine valve control |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6601552B2 (en) * | 1998-11-19 | 2003-08-05 | Daimlerchrysler Ag | Hydraulically controllable globe valve |
US20040123825A1 (en) * | 2002-12-17 | 2004-07-01 | Shuji Nagano | Valve system for internal combustion engine |
US6959675B2 (en) * | 2002-12-17 | 2005-11-01 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Valve system for internal combustion engine |
US7194991B2 (en) | 2005-06-16 | 2007-03-27 | Zheng Lou | Variable valve actuator |
US20060283410A1 (en) * | 2005-06-16 | 2006-12-21 | Zheng Lou | Variable valve actuator |
US20060283411A1 (en) * | 2005-06-16 | 2006-12-21 | Zheng Lou | Variable valve actuator |
US7156058B1 (en) | 2005-06-16 | 2007-01-02 | Zheng Lou | Variable valve actuator |
US7302920B2 (en) | 2005-06-16 | 2007-12-04 | Zheng Lou | Variable valve actuator |
US20060283408A1 (en) * | 2005-06-16 | 2006-12-21 | Zheng Lou | Variable valve actuator |
US7213549B2 (en) | 2005-08-01 | 2007-05-08 | Zheng Lou | Variable valve actuator |
WO2007016519A2 (en) * | 2005-08-01 | 2007-02-08 | Lgd Technology, Llc | Variable valve actuator |
WO2007016519A3 (en) * | 2005-08-01 | 2007-05-03 | Lgd Technologies Llc | Variable valve actuator |
US20070022988A1 (en) * | 2005-08-01 | 2007-02-01 | Zheng Lou | Variable valve actuator |
US7290509B2 (en) | 2005-08-01 | 2007-11-06 | Zheng Lou | Variable valve actuator |
US20070022987A1 (en) * | 2005-08-01 | 2007-02-01 | Zheng Lou | Variable valve actuator |
US7370615B2 (en) | 2005-08-01 | 2008-05-13 | Lgd Technology, Llc | Variable valve actuator |
CN101233300B (en) * | 2005-08-01 | 2012-07-25 | Lgd技术有限责任公司 | Variable valve actuator |
US20080054205A1 (en) * | 2006-08-30 | 2008-03-06 | Zheng Lou | Variable valve actuator with latches at both ends |
US7766302B2 (en) * | 2006-08-30 | 2010-08-03 | Lgd Technology, Llc | Variable valve actuator with latches at both ends |
US8978604B2 (en) | 2012-03-31 | 2015-03-17 | Jiangsu Gongda Power Technologies Co., Ltd. | Variable valve actuator |
Also Published As
Publication number | Publication date |
---|---|
JP2000515605A (en) | 2000-11-21 |
DE19716042C1 (en) | 1998-05-07 |
DE59802536D1 (en) | 2002-01-31 |
EP0975856B1 (en) | 2001-12-19 |
WO1998048151A1 (en) | 1998-10-29 |
EP0975856A1 (en) | 2000-02-02 |
JP3348201B2 (en) | 2002-11-20 |
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